/* KidsGenAI — Light Blue Theme + Illustrated Preloaded Cards (v4) */
:root{
  --sky:#1F8DD6;
  --ink:#0B2239;
  --cream:#FFF7EA;
  --ring:#E8EEF6;
  --muted:#5C6E85;
  --chip:#11324D;
  --chip-bg:#E9F2FF;
  --cta:#0B2239;
  --ctaText:#fff;
}
*{box-sizing:border-box}
html,body{margin:0;font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial;background:var(--sky);color:var(--ink)}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}

header{position:sticky;top:0;background:var(--cream);border-bottom:1px solid var(--ring);z-index:10}
.header-inner{max-width:1120px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;gap:10px;align-items:center;font-weight:900}
.logo img{height:36px;border-radius:8px}

main{max-width:1120px;margin:0 auto;padding:22px}
.card{background:var(--cream);border:1px solid var(--ring);border-radius:22px;padding:22px;box-shadow:0 12px 24px rgba(0,0,0,.08)}
h1{margin:0 0 12px;font-size:42px;line-height:1.12}
p.lead{color:#3E4E62;margin:0 0 16px}
.badge{display:inline-block;background:#FFE6DE;color:#D63C2E;border-radius:999px;padding:6px 12px;margin-bottom:12px;font-weight:800}

/* Age buttons */
.age-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.btn-age{display:block;text-align:center;background:#fff;border:2px solid var(--ring);border-radius:16px;padding:18px;font-weight:900;box-shadow:0 8px 16px rgba(0,0,0,.06);transition:transform .15s, box-shadow .15s}
.btn-age:hover{transform:translateY(-2px);box-shadow:0 12px 20px rgba(0,0,0,.08)}

/* Grid Cards */
.section-title{font-size:22px;margin:22px 0 10px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.tile{border:1px solid var(--ring);border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 6px 12px rgba(0,0,0,.06)}
.tile > a{display:flex;flex-direction:column;height:100%}
.thumb{height:140px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.thumb::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.18) 1px, transparent 1px);background-size:14px 14px;mix-blend-mode:overlay;pointer-events:none}
.body{padding:14px;display:flex;flex-direction:column;gap:8px}
.title{font-weight:800;font-size:1.06rem}
.row{display:flex;gap:8px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;font-weight:800;color:var(--chip);background:var(--chip-bg);border-radius:999px;padding:6px 10px;font-size:.78rem}
.cta{margin-top:auto;align-self:flex-start;background:var(--cta);color:var(--ctaText);border-radius:10px;padding:8px 12px;font-weight:800}

/* Thumb backgrounds */
.thumb.redgold{background:linear-gradient(180deg,#F25F3A 0%, #F25F3A 60%, #FCD34D 60%)}
.thumb.goldpink{background:linear-gradient(180deg,#FCD34D 0%, #FCD34D 55%, #FEE2E2 55%)}
.thumb.deepblue{background:linear-gradient(180deg,#0B5EA8 0%, #0B5EA8 100%)}
.thumb.sunny{background:linear-gradient(180deg,#FFE08A 0%, #FFE08A 100%)}
.thumb.garden{background:linear-gradient(180deg,#F9FAFB 0%, #FCE7F3 100%)}
.thumb.meadow{background:linear-gradient(180deg,#ECFCCB 0%, #FDE68A 100%)}
.thumb.sky{background:linear-gradient(180deg,#D1E9FF 0%, #9ED2FF 100%)}
.thumb.peach{background:linear-gradient(180deg,#FFE4C7 0%, #FEE2E2 100%)}

.tile > a:focus-visible{outline:3px solid #0EA5E9;outline-offset:-3px}

/* Reader */
.reader{max-width:900px;margin:0 auto}
.reader .toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.btn{display:inline-block;background:#0B2239;color:#fff;border-radius:10px;padding:10px 14px;font-weight:800}
.btn.brand{background:#F04438}
footer{text-align:center;color:#E6F1FB;padding:28px}